EP0654842B1 - Dielektrische Filteranordnung - Google Patents

Dielektrische Filteranordnung Download PDF

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Publication number
EP0654842B1
EP0654842B1 EP94308700A EP94308700A EP0654842B1 EP 0654842 B1 EP0654842 B1 EP 0654842B1 EP 94308700 A EP94308700 A EP 94308700A EP 94308700 A EP94308700 A EP 94308700A EP 0654842 B1 EP0654842 B1 EP 0654842B1
Authority
EP
European Patent Office
Prior art keywords
resonant
ceramic body
resonator
dielectric ceramic
signal transmission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94308700A
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English (en)
French (fr)
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EP0654842A1 (de
Inventor
Kenji Ito
Hotaka Oguchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Niterra Co Ltd
Original Assignee
NGK Spark Plug Co Ltd
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Filing date
Publication date
Application filed by NGK Spark Plug Co Ltd filed Critical NGK Spark Plug Co Ltd
Publication of EP0654842A1 publication Critical patent/EP0654842A1/de
Application granted granted Critical
Publication of EP0654842B1 publication Critical patent/EP0654842B1/de
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies
    • H01P1/2136—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies using comb or interdigital filters; using cascaded coaxial cavities
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators

Definitions

  • the present invention relates to a dielectric filter device comprising dielectric resonators to be used for signal transmission and reception respectively.
  • Japanese Patent KOKAI No. 63-144602 discloses a dielectric filter device comprising a dielectric coaxial resonator for signal transmission and a dielectric coaxial resonator for signal reception with their respective open sides directed oppositely in order to prevent undesired coupling of the dielectric coaxial resonator for signal transmission and the dielectric coaxial resonator for signal reception.
  • Japanese Patent KOKAI No. 4-121103 discloses a dielectric filter device comprising resonators and coupling substrates for carrying out interstage/input-output coupling for the resonators, these components being held in a case.
  • Japanese Patent KOKAI No. 60-57203 discloses a device constituted of a plurality of dielectric filters, each comprising dielectric resonators and being arranged with branching circuit formed on ceramic substrates.
  • any of the above described devices are proposed as dielectric antenna multiplexers and comprise branching circuits that are arranged independently from the dielectric resonators of the device and connected to an antenna and coupling elements such as capacitors that are disposed between the dielectric resonators.
  • branching circuits that are arranged independently from the dielectric resonators of the device and connected to an antenna and coupling elements such as capacitors that are disposed between the dielectric resonators.
  • noises can often appear in conventional dielectric filter devices due to inductive or electromagnetic coupling that occur between the dielectric resonators for signal transmission and those for signal reception to make the filtering operation unstable. While the use of coils and capacitors as well as other improved coupling and/or connecting members has been proposed to avoid these problems, such additional components require additional space for the filter device to make it rather bulky and costly.
  • US 5,109,536 and US 5,250,916 each show a dielectric filter having a ceramic body coated with a conductive layer over some of its surfaces.
  • the ceramic body also has a plurality of resonant holes formed therein, each hole being internally coated with a conductive layer.
  • US 5,109,536 also shows an antenna connected to a conductive pad formed upon an end surface. The end surface is not coated with a conductive layer.
  • a dielectric filter device comprising a dielectric ceramic body having an outer surface provided with an outer conductive layer, a resonator for signal transmission having a plurality of resonant holes arranged within the dielectric ceramic body, each of which has a peripheral wall coated with a resonant conductive member, a resonator for signal reception having a plurality of resonant holes arranged within the dielectric ceramic body, each of which has a peripheral wall coated with a resonant conductive member, an output port communicated with the innermost resonant hole in the resonator for signal transmission and having a connecting conductive layer which is electrically connected to the resonant conductive member of the innermost resonant hole in the resonator for signal transmission, an input port communicated with the innermost resonant hole in the resonator for signal reception having a connecting conductive layer which is electrically connected to the resonant conductive member of the innermost resonant hole in the resonator for signal transmission, an input port
  • the resonators for signal transmission and signal reception are arranged interdigitally and the adjacently located resonant conductive member of the resonator for signal transmission and that of the resonator for signal reception are arranged in parallel and directed in a same sense. since the resonant conductive members of the resonator for signal transmission and those for signal reception are arranged interdigitally, the resonators are mutually coupled to eliminate the necessity of arranging additional coupling members such as capacitors. Additionally, since the adjacently located resonant conductive member of the resonator for signal transmission and that of the resonator for signal reception are arranged in parallel and directed in a same sense, the device is protected against inductive coupling without using any protective means such as an earthing shield.
  • the dielectric ceramic body may be preferably rectangularly parallelepipedic and provided in the inside with a plurality of through holes, the peripheral wall of each of the through holes being coated with a conductive material to form the resonant conductive member.
  • the dielectric ceramic body may be constituted of a pair of ceramic substrates laid one on the other.
  • the resonant conductive members of the resonator for signal transmission and those of the resonator for signal reception are arranged between the layered substrates.
  • the dielectric filter device since a single branching circuit is arranged on the grounded outer surface of the filter device, the number of components of the device is significantly reduced if compared with a conventional dielectric filter device provided with branching circuits separately prepared.
  • the embodiment comprises a dielectric ceramic body 1 substantially having a rectangularly parallelepipedic profile and provided with a total of six resonant holes 2 bored through between the front surface la and the rear surface 1b of the dielectric ceramic body 1, the peripheral wall of each of the resonant holes 2 being coated with a layer of a conductive material to form a resonant conductive member 3.
  • the left three are used for a resonator T for signal transmission whereas the remaining right three are used for a resonator R for signal reception.
  • the upper, lower and lateral surfaces of the dielectric ceramic body 1 are coated with a conductive material to form an outer conductive layer 4 which is electrically held to the ground potential.
  • the outer conductive layer 4 partly extends to the front surface la of the dielectric ceramic body 1 over the oppositely disposed lateral front edges thereof to form front end outer conductive members 4a, 4a, which are respectively and electrically connected to the front ends of the leftmost and rightmost resonant conductive members 3 in the respective resonators T and R so that these front ends are made to be short-circuited ends, whereas the rear ends of these resonant conductive members 3 are electrically insulated from the outer conductive member 4 to become open-circuit ends.
  • the front end of the central resonant conductive member 3 in the resonator T for signal transmission and that of the central resonant conductive member 3 in the resonator R for signal reception are open-ended at the front surface la of the dielectric ceramic body 1 whereas their rear ends are short-circuited at the rear surface 1b of the ceramic body 1.
  • the resonant conductive members 3 in the resonator T for signal transmission and the resonator R for signal reception are interdigitally arranged.
  • the innermost one of the resonant conductive members of the resonator T for signal transmission and that of the resonant conductive members for the resonator R for signal reception have respective shortcircuited ends at the front surface la of the ceramic body 1 and hence are commonly directed in a same sense.
  • This arrangement of directing both the innermost resonant conductive member for the resonator T for signal transmission and its counterpart for the resonator R for signal transmission in a same sense prevents any undesired inductive coupling from taking place so that they may be coupled without using an earthing shield.
  • a branching circuit 5 is arranged on the upper surface of the dielectric ceramic body 1 which is coated with the outer conductive member 4 in such a manner that the branching circuit 5 is separated and electrically insulated from the outer conductive member 4 by a gap 6 and then connected to an antenna terminal 7 formed at the center of the front surface la of the dielectric ceramic body 1. As seen in Fig. 3, the antenna terminal 7 extends to the underside of the dielectric ceramic body 1.
  • An input terminal 8 is arranged on the left side 1c of the dielectric ceramic body 1 for the resonator T for signal transmission, while an output terminal 9 is arranged on the left lateral side 1d of the dielectric ceramic body 1 for the resonator R for signal reception, the terminals being separated and electrically insulated from the outer conductive member 4 by respective gaps 10 and extending to the underside of the dielectric ceramic main body 1 as shown in Fig. 3.
  • an input port 11 is arranged between the input terminal 8 of the resonator T for signal transmission and the resonant hole 2 of the leftmost resonant conductive member 3 of the resonator T for signal transmission and the peripheral inner wall of the input outlet port 11 is coated with a connecting conductive layer 12 so that the leftmost resonant conductive member 3 is electrically connected to the input terminal 8.
  • an output port 13 is arranged between the resonant hole 2 of the rightmost resonant conductive member 3 of the resonator T for signal transmission and the upper surface of the dielectric ceramic body 1 and the peripheral inner wall of the output port 13 is coated with a connecting conductive layer 14 that electrically connects the rightmost one of the resonant conductive members 3 of the resonator T and the branching circuit 5.
  • an input port 15 is arranged between the resonant hole 2 of the leftmost resonant conductive member 3 of the resonator R for signal reception and the upper surface of the dielectric ceramic body 1 and the peripheral inner wall of the input port is coated with a connecting conductive layer 16 that electrically connects the leftmost one of the resonant conductive members 3 of the resonator R for signal reception and the branching circuit 5.
  • a laterally extending output port 17 is arranged between the right side 1c of the dielectric ceramic body 1 and the resonant hole 2 of the rightmost resonant conductive member 3 of the resonator R for signal reception and the peripheral inner wall of the output port 17 is coated with a connecting conductive layer 18 so that the rightmost resonant conductive member 3 of the resonator R for signal reception is electrically connected to the output terminal 9 of the resonator R for signal reception.
  • a pair of interstage coupling regulator grooves 19 are formed longitudinally on the upper surface of the dielectric ceramic body 1 along the boundary lines separating the resonant conductive members of the resonator T for signal transmission and another pair of interstage coupling regulator grooves 19 are formed also longitudinally on the upper surface of the dielectric ceramic body 1 along the boundary lines separating the resonant conductive members of the resonator R for signal reception.
  • electrodes 20 are arranged on the surfaces of the interstage coupling regulator grooves 19.
  • a dielectric filter device having a configuration as described above is suitably used as a multiplexer for a dielectric antenna and typically mounted on a printed circuit board (now shown).
  • the above embodiment has a dielectric ceramic body containing therein filter elements arranged on in parallel on a same level, it may be so modified that it comprises a pair of dielectric ceramic substrates arranged in two layers and a plurality of stripline type resonant conductive members constituting a resonator for signal transmission and those constituting a resonator for signal reception are arranged on the respective inner surfaces of the dielectric ceramic substrates.
  • the resonator for signal transmission and the resonator for signal reception equally comprises three resonant conductive members for each in the above embodiment, they may alternatively comprises two or more than three resonant conductive members for each of them.
  • the input and output coupling sections of the above embodiment are electrically connected to the resonant conductive members by way of the rconnecting conductive members in the above embodiment, the input and output coupling sections may alternatively be capacitively coupled with the resonant conductive members.
  • a dielectric filter device comprises the branching circuit arranged on the grounded outer surface of its filter elements, the overall number of parts of the device is made significantly smaller than that of any comparable devices comprising a separately arranged branching circuit and hence it is apt to be remarkably down-sized. Consequently, since variances in the performance that can appear as a result of assembling the parts are significantly eliminated, it is greatly exempted from cumbersome adjusting operations that may otherwise be required after the assembly and the time required for the entire operation of assembling the parts can also be remarkably reduced.
  • a dielectric filter device comprises resonant conductive members of a resonator for signal transmission and those of a resonator for signal reception arranged interdigitally and mutually coupled to eliminate the necessity of using any other coupling elements such as capacitors and the adjacently located resonant conductive member of the resonator for signal transmission and that of the resonator for signal reception are arranged in parallel and directed in a same sense, any inductive coupling that may adversely affect the performance of the filter device is prevented from taking place without using an earthing shield or some other protective means.
  • the overall number of parts of the device is made significantly smaller than that of any comparable devices and hence the number of steps for assembling the parts is remarkably reduced so that down-sized high quality dielectric filter devices can be manufactured and supplied at low cost.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Claims (2)

  1. Dielektrische Filtereinrichtung, umfassend einen dielektrischen Keramikkörper (1) mit einer äußeren Oberfläche, die mit einer äußeren leitfähigen Lage (4) versehen ist, einem Resonator (T) zur Signalübertragung mit einer Mehrzahl von resonanten Löchern (2), die in dem dielektrischen Keramikkörper (1) angeordnet sind, von denen jedes eine Umfangswandung mit einem resonanten leitfähigen Glied beschichtet aufweist, einem Resonator (R) zum Signalempfang mit einer Mehrzahl von resonanten Löchern (2), die in dem dielektrischen Keramikkörper (1) angeordnet sind, von denen jedes eine Umfangswandung mit einem resonanten leitfähigen Glied (3) beschichtet aufweist, einem Ausgangsport (13), der in Verbindung steht mit dem innersten resonanten Loch (2) in dem Resonator (T) zur Signalübertragung und eine Verbindungsleitungslage (14) aufweist, die elektrisch verbunden mit dem resonanten leitfähigen Glied (3) des innersten resonanten Lochs (2) in dem Resonator (T) zur Signalübertragung ist, einem Eingangsport (15), der in Verbindung steht mit dem innersten resonanten Loch (2) in dem Resonator (R) zum Signalempfang und eine Verbindungsleitungslage (16) aufweist, die elektrisch verbunden mit dem resonanten leitfähigen Glied (3) des innersten resonanten Lochs (2) in dem Resonator (R) zum Signalempfang ist, Eingang/Ausgang-Kopplungsabschnitten (8, 9), die an der äußeren Oberfläche des dielektrischen Keramikkörpers (1) angeordnet sind und betriebsmäßig mit den jeweiligen Resonatoren (T, R) gekoppelt sind, sowie einem Antennenanschluß (7), der an der äußeren Oberfläche des dielektrischen Keramikkörpers (1) angeordnet ist, dadurch gekennzeichnet, daß eine Verzweigungsschaltung (5) an einem Abschnitt von einer der äußeren Oberflächen des dielektrischen Keramikkörpers (1) vorgesehen ist, auf welcher die äußere leitfähige Lage (4) vorgesehen ist, wobei die Verzweigungsschaltung für eine elektrische Verbindung der Verbindungsleitungslage (14) des Ausgangsports (13), der Verbindungsleitungslage (16) des Eingangsports (15) und des Antennenanschlusses (7) ausgebildet ist, daß die Verzweigungsschaltung (5) getrennt und elektrisch isoliert von der äußeren leitfähigen Lage (4) des dielektrischen Keramikkörpers (1) ist, daß die resonanten leitfähigen Glieder (3) zur Signalübertragung und zum Signalempfang ineinandergreifend angeordnet sind, und daß die innersten der resonanten leitfähigen Glieder (3) zur Signalübertragung und zum Signalempfang einander benachbart angeordnet sind und derart angeordnet sind, daß jeweilige erste Enden davon mit dem äußeren leitfähigen Glied verbunden sind und an einer gemeinsamen Seite des Keramikkörpers (1) angeordnet sind.
  2. Dielektrische Filtereinrichtung nach Anspruch 1, wobei jedes der resonanten leitfähigen Glieder (3) zur Signalübertragung, die in dem dielektrischen Keramikkörper (1) angeordnet sind, ein erstes Ende mit dem äußeren leitfähigen Glied (4) verbunden und ein zweites, entgegengesetztes Ende von dem äußeren leitfähigen Glied (4) getrennt aufweist, wobei jedes der leitfähigen Glieder (3) zum Signalempfang, die in dem dielektrischen Keramikkörper (1) angeordnet sind, ein erstes Ende mit dem äußeren leitfähigen Glied (4) verbunden und ein zweites, entgegengesetztes Ende getrennt von dem äußeren leitfähigen Glied (4) aufweist, wobei die resonanten leitfähigen Glieder (3) zur Signalübertragung und zum Signalempfang ineinandergreifend angeordnet sind, und wobei innerste der resonanten leitfähigen Glieder (3) zur Signalübertragung und zum Signalempfang einander benachbart angeordnet und derart angeordnet sind, daß die jeweiligen ersten Enden davon an einer gemeinsamen Seite des Keramikkörpers (1) angeordnet sind.
EP94308700A 1993-11-24 1994-11-24 Dielektrische Filteranordnung Expired - Lifetime EP0654842B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP29359993A JP3405783B2 (ja) 1993-11-24 1993-11-24 誘電体フィルタ装置
JP29359993 1993-11-24
JP293599/93 1993-11-24

Publications (2)

Publication Number Publication Date
EP0654842A1 EP0654842A1 (de) 1995-05-24
EP0654842B1 true EP0654842B1 (de) 2001-07-18

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Application Number Title Priority Date Filing Date
EP94308700A Expired - Lifetime EP0654842B1 (de) 1993-11-24 1994-11-24 Dielektrische Filteranordnung

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EP (1) EP0654842B1 (de)
JP (1) JP3405783B2 (de)
KR (1) KR100201751B1 (de)
DE (1) DE69427739T2 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10145110A (ja) * 1996-11-05 1998-05-29 Murata Mfg Co Ltd 複合誘電体フィルタ
US6052040A (en) * 1997-03-03 2000-04-18 Ngk Spark Plug Co., Ltd. Dielectric duplexer with different capacitive coupling between antenna pad and transmitting and receiving sections
JPH10335906A (ja) 1997-03-31 1998-12-18 Murata Mfg Co Ltd 誘電体フィルタ、誘電体デュプレクサ及び通信機装置
JP3387422B2 (ja) * 1998-08-25 2003-03-17 株式会社村田製作所 アンテナ共用器及び通信機装置
KR100431938B1 (ko) * 2000-12-29 2004-05-20 엘지이노텍 주식회사 일체형 이중대역 듀플렉서
US11081769B2 (en) 2015-04-09 2021-08-03 Cts Corporation RF dielectric waveguide duplexer filter module
US10483608B2 (en) 2015-04-09 2019-11-19 Cts Corporation RF dielectric waveguide duplexer filter module
WO2018057722A1 (en) * 2016-09-23 2018-03-29 Cts Corporation Ceramic rf filter with structure for blocking rf signal coupling
US11437691B2 (en) 2019-06-26 2022-09-06 Cts Corporation Dielectric waveguide filter with trap resonator

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4168479A (en) * 1977-10-25 1979-09-18 The United States Of America As Represented By The Secretary Of The Navy Millimeter wave MIC diplexer
JPS57148403A (en) * 1981-03-09 1982-09-13 Yagi Antenna Co Ltd Branching filter
JPH0246082Y2 (de) * 1985-04-04 1990-12-05
US5109536A (en) * 1989-10-27 1992-04-28 Motorola, Inc. Single-block filter for antenna duplexing and antenna-summed diversity
US5250916A (en) * 1992-04-30 1993-10-05 Motorola, Inc. Multi-passband dielectric filter construction having filter portions with dissimilarly-sized resonators
JP3101460B2 (ja) * 1992-04-03 2000-10-23 三洋電機株式会社 誘電体フィルタおよびこれを用いた分波器

Also Published As

Publication number Publication date
KR950015978A (ko) 1995-06-17
DE69427739T2 (de) 2001-10-31
JP3405783B2 (ja) 2003-05-12
DE69427739D1 (de) 2001-08-23
KR100201751B1 (ko) 1999-06-15
JPH07147506A (ja) 1995-06-06
EP0654842A1 (de) 1995-05-24

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